minor #14101 [Configuration] improve description for ignoreExtraKeys on ArrayNodeDefinition (cordoval)
minor #14101 [Configuration] improve description for ignoreExtraKeys on ArrayNodeDefinition (cordoval)

This PR was merged into the 2.3 branch.

Discussion
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[Configuration] improve description for ignoreExtraKeys on ArrayNodeDefinition

|Q            |A  |
|---          |---|
|Bug Fix?     |y  |
|New Feature? |n  |
|BC Breaks?   |n  |
|Deprecations?|n  |
|Tests Pass?  |y  |
|Fixed Tickets| #13957  |
|License      |MIT|
|Doc PR       |   |

Commits
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b735022 [Configuration] improve description for ignoreExtraKeys on ArrayNodeDefinition

symfony/Config